Fig. 3
From: A global dataset of gross nitrogen transformation rates across terrestrial ecosystems
Keyword analysis results for the study titles and abstracts. The analysis was performed by RAKE (Rapid Automatic Keyword Extraction) algorithm for natural language processing (NLP), the function offered by R ‘udpipe’ package. The study titles and abstracts were collected from the final literature selection for data extraction in this work. Converted all text to lowercase for consistency in the NLP keyword detection.
